We review the submillimetric PRONAOS observations in the direction of the IC 1318a nebular located at the edge of an ionized region in the Cygnus X complex. The extended emission measured in the PRONAOS four broad photometric bands extending from 200 up to 1100 μm enables a full characterization of the interstellar dust big grains component radiating at thermal equilibrium, leading to a temperature and column density mapping.
